Figma MCP: turning Claude-generated UI into a component library

This is the stretch nobody films. The demo ends at the screenshot; the job ends about a week later, in a Figma file that someone else has to be able to open without you in the room. It's also where roughly 40% of the work lives, and where most AI-assisted design quietly falls over — not because the screens are bad, but because nothing in them is addressable. Import destroys the names Bring generated markup into Figma and everything arrives as a frame inside a frame inside a frame, with names that mean nothing. The structure survives. The meaning doesn't. The instinct at this point is to start componentising from what's on the canvas — find a button in a screen, make it a component, move on. Don't. That tree is a rendering artefact. Build your library from it and you inherit every accident in it: wrapper divs promoted to components, layout containers baked into masters, the same element modelled three different ways because it appeared in three different screens. The source markup is the specification. It knows what each thing is. So the first move is reading it and producing a record of what should exist and what it should be called — then renaming against that record, then componentising. Rename first, componentise second. Reversing those two costs more than any other ordering mistake in this stage. Library first, screens second Masters get built in a clean library section, not harvested from inside screens. The difference shows up in what ends up inside the component. Harvested masters carry their surroundings — a padding wrapper that belonged to the screen, a demo label, a background that existed to make it visible on a dark canvas. Those things then travel into every instance, and six months later somebody is asking why every card has eight pixels of phantom padding. Same-structure things get grouped into a variant set rather than left as separate components. A button that arrives as five unrelated components instead of one set is the single most common breakage